lwpoint_clip_to_ordinate_range()

LWCOLLECTION* lwpoint_clip_to_ordinate_range	(	const LWPOINT *	point,
		char	ordinate,
		double	from,
		double	to
	)

Clip a point based on the from/to range of one of its ordinates.

Use for m- and z- clipping

Clip a point based on the from/to range of one of its ordinates.

Definition at line 364 of file lwlinearreferencing.c.

{
        LWCOLLECTION *lwgeom_out = NULL;
        char hasz, hasm;
        POINT4D p4d;
        double ordinate_value;
 
        /* Nothing to do with NULL */
        if ( ! point )
                lwerror("Null input geometry.");
 
        /* Ensure 'from' is less than 'to'. */
        if ( to < from )
        {
                double t = from;
                from = to;
                to = t;
        }
 
        /* Read Z/M info */
        hasz = lwgeom_has_z(lwpoint_as_lwgeom(point));
        hasm = lwgeom_has_m(lwpoint_as_lwgeom(point));
 
        /* Prepare return object */
        lwgeom_out = lwcollection_construct_empty(MULTIPOINTTYPE, point->srid, hasz, hasm);
 
        /* Test if ordinate is in range */
        lwpoint_getPoint4d_p(point, &p4d);
        ordinate_value = lwpoint_get_ordinate(&p4d, ordinate);
        if ( from <= ordinate_value && to >= ordinate_value )
        {
                LWPOINT *lwp = lwpoint_clone(point);
                lwcollection_add_lwgeom(lwgeom_out, lwpoint_as_lwgeom(lwp));
        }
 
        /* Set the bbox, if necessary */
        if ( lwgeom_out->bbox )
        {
                lwgeom_refresh_bbox((LWGEOM*)lwgeom_out);
        }
 
        return lwgeom_out;
}

References LWCOLLECTION::bbox, lwcollection_add_lwgeom(), lwcollection_construct_empty(), lwerror(), lwgeom_has_m(), lwgeom_has_z(), lwgeom_refresh_bbox(), lwpoint_as_lwgeom(), lwpoint_clone(), lwpoint_get_ordinate(), lwpoint_getPoint4d_p(), MULTIPOINTTYPE, and LWPOINT::srid.

Referenced by lwgeom_clip_to_ordinate_range().

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